Clams
I will keep Clams and co, however nerving them in some way, like increasing cost for each additional forge. There's only that much earth blood that can be squeezed out, and you have to drill deeper and deeper.
The chalice and artifacts
Hmm, whats the main reason for rushing to const8?
I'd like to make some oft hese unforgeable and hand them out to players for special archievements. Maybe winning the first arena battle after turn 40, if possible.